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gain
It doesn't lose or gain
It needs to gain 3 electrons than to lose 5 electrons. So phosphorus has to gain 3 electrons.
It will lose 2 to form Sr2+
It will gain an electron so that it can complete a full outer shell of 8 electrons.
gain
gain
In phosphene it gain 4 electrons. Phosphate lose 4 electrons
Bromine will gain one electron to become Br-
Oxygen will gain two electrons to achieve a full outer shell.
As fluorine is a halogen (the group in which the elements are more reactive as they are one electron lesser than that of the octet configuration)and hence it can only gain electrons.
Selenium can gain 1 electron or loss 2, 4, 6 electrons.
Fluorine gains an electron when forming bonds as fluorine is very electronegative. This behavior is due to the fact that gaining an electron gives fluorine a noble gas electron configuration.
Because Sodium is in group 1, it tends to lose one electron when forming an ion, therefore having a charge of +1
Cl has a tendency to gin electrons in a reaction, this is due to the fact that it has 7 electrons already, its much easier for chlorine to gain one more electron to have a full shell than to lose 7 and have a full shell.
Fluorine gains one electron to form a fluoride ion.
A chlorine atom will gain one electron when forming an ion. That will give the ion a charge of 1-.